How Do I Calculate My PC’s Watt Usage for Upgrades?

I'm considering upgrading my PC by changing the CPU cooler and adding more RAM. I currently have a 600W power supply unit (PSU), but I'm unsure of the wattage for all my components. I'm a bit skeptical about the watt usage numbers on PCPartPicker after seeing differing values for my CPU cooler. Here's what I have: an AMD Ryzen 5 3600XT, GSKILL FlareX 16GB RAM (adding another stick), a B450 AORUS M motherboard, and a Gigabyte Eagle RTX 3060. My case is a Masterbox MB511, and I also have some additional fans. I'm planning to upgrade to the ARCTIC Freezer 36 cooler, but I'd like advice on how to accurately assess my wattage needs.